Router sub base



FIG. 1 is a perspective view of a router sub base showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom plan view thereof;

FIG. 4 is a front elevational view thereof;

FIG. 5 is an end elevational view taken from the left in FIG. 2;

FIG. 6 is an end elevational view taken from the right in FIG. 2, and

FIG. 7 is a sectional view taken in the direction of the arrows along line 7--7 in FIG. 2. 

The ornamental design for a router sub base, as substantially shown and described. 